MSES Consultants  
   An environmental consulting firm providing services in the areas of planning, engineering, safety, industrial hygiene, the earth and environmental sciences, design and regulatory assistance. The firm is located in Clarksburg, West Virginia, USA.
   http://www.msesinc.com

Applied Modeling Inc. (AMI)  
   Consultants (in Woodland Hills, California, USA) who offer services in: dispersion modeling (using ISCST3 model); regional air quality modeling (for ozone and for particulate matter); urban airshed modeling; and accidental release modeling (using ALOHA, C
   http://www.amiace.com

DNV  
   Det Norske Veritas (DNV), headquartered in Oslo, Norway, is an international consulting firm with numerous offices worldwide. Their primary focus is on safety, environmental, risk management, and consequence analyses using their own PHAST dispersion model
   http://www.dnv.com

Bison Engineering, Inc.  
   An environmental engineering firm headquartered in Helena, Montana, USA, whose services include: air dispersion modeling; air emission inventories, air permit applications, and risk management plans (RMPs).
   http://www.bison-eng.com/air.html

AirNova Inc.  
   Services include stack testing, stationary source isokinetic sampling, continuous emission monitoring, compliance permitting, air toxics pollution emission sampling, ambient air quality dispersion modeling. Located in Pennsauken, New Jersey, USA.
   http://www.airnova.com

Cambridge Environmental Research Consultants  
   Scientific consultants in the field of atmospheric dispersion located in Cambridge, England.. They offer a range of air dispersion models including: ADMS 3 for dispersion of industrial emissions; ADMS-SCREEN for initial screening studies of emission
   http://www.cerc.co.uk

Enviroware s.r.l.  
   These consultants, located in Italy, provide a number of air dispersion models. The site includes an online Gaussian dispersion model called Tox-Flam, for releases of inert buoyant pollutants into a mixing layer of a user-specified height.
   http://www.enviroware.com

McVehil-Monnett Associates  
   An air quality consulting firm, headquartered in Englewood, Colorado, USA with other offices in Arizona and Wyoming. Their services include air dispersion modeling for determining: ambient impacts for permitting industrial sources, impacts of cooling tow
   http://www.mcvehil-monnett.com/

Meteorological Solutions Inc.  
   Air quality consultants (located in Salt Lake City, Utah, USA) who provide a comprehensive range of air dispersion modeling services. The site includes links to the specifics of their various services as well as to a listing of the names, email addresses,
   http://www.metsolution.com/

Tech Environmental Inc. (TEI)  
   Located in Waltham, Massachusetts, USA, TEI provides consulting for air quality and noise issues. Their services include: permit applications; siting and feasibility studies; environmental impact assessments; and technical support tasks such as air disper
   http://techenv.com/

MET Associates  
   A consultant firm in Dayton, Texas, USA that provides litigation support and expert witness testimony to environmental lawyers and to insurance companies for either plaintiffs or defendants in court cases that involve air dispersion and air quality modeli
   http://www.metassociates.net/

ENSR: Environmental Consultants and Engineers  
   A worldwide environmental service company (headquartered in Westford, Massachusetts, USA) that has developed: dispersion models that accommodate complex terrain and aerodynamic downwash; visibility models; hazardous air pollutant dispersion models; and ot
   http://www.ensr.com

RTP Environmental Associates  
   RTP has offices nationwide in the USA and has performed modeling studies for: rural and urban locations; single-point sources; complex multi-source industrial sources; flat terrain; complex terrain; and time and spatial scales from short-term to multi-yea
   http://rtpenv.com/

Dyadem International, Ltd.  
   A software development company in Toronto, Canada that also provides a full range of risk management consulting services. They offer software for Risk Analysis, Process Hazard Analysis (PHA), HAZOP, Failure Modes and Effects Analysis (FMEA), and Risk Mana
   http://www.dyadem.com

North American Weather Consultants  
   Meteorological consultants (located in Salt Lake City, Utah, USA) who offer extensive experience in performing dispersion modeling for: simple, complex or intermediate terrain; single or multiple emission points; and buoyant or dense gas releases.
   http://www.xmission.com/~nawc/aq.html

Earth Tech  
   A worldwide environmental consultant firm, headquartered in Long Beach, California, USA, whose modeling group are recognized experts in air dispersion modeling. They have developed or enhanced many models (CALPUFF, CALMET, CALGRID, BLP, ISC3, CTDMPLUS, O
   http://src.com/aq/amodels1.htm

ENVIRON: Environmental Consultants  
   An international firm (headquartered in Novato, California, USA) offering services in: dispersion modeling of emissions from industrial plants and hazardous waste sites; air toxics impact studies; air pollution compliance assistance; emergency release mo
   http://www.environ.org/as.html

Acu Tech  
   A nation-wide consultant firm (headquartered in San Francisco, California, USA) specializing in process safety and risk management services, training, and software. AcuTech makes use of these dispersion modeling programs: ALOHA, ARCHIE, DEGADIS, HGSYSTEM
   http://www.acutech-consulting.com/consulting/release.html

WebMET  
   WebMET is a repository of meteorological data for air dispersion models such as ISCST3, ISC-PRIME and AERMOD, as well as for digital elevation terrain data. The data covers the entire United States and can be downloaded free of charge. The site is sponso
   http://www.webmet.com

Grove Scientific Engineering  
   Environmental engineering consultants, located in Orlando, Florida, USA, whose services include: industrial air pollution studies, air permitting, emission inventories and air dispersion modeling.
   http://www.grovescientific.com/air_pollution.html

Hastings Engineering, Inc.  
   Chemical and environmental consultants based in St. Louis, Missouri, USA whose services include air dispersion modeling used for: air permitting, accidental release modeling, and risk assessments.
   http://www.hastingsengineering.com/Engineers.htm

Iris Environmental  
   Consulting and engineering firm based in Oakland, California , USA whose environmental management services include air dispersion modeling.
   http://www.irisenv.com/main/

Zephyr Environmental Corporation  
   An environmental consulting firm, headquartered in Austin, Texas, USA, whose air dispersion modeling services include: simple and complex terrain modeling; line and mobile source modeling; and modeling of accidental dense gas releases. Zephyr utilizes U.
   http://www.zephyrenv.com/nonframes/serv.air.html

Aegis Environmental Inc.  
   Located in Richmond, Virginia, USA, the Aegis Environmental firm offers environmental consulting services including air dispersion modeling, offsite consequence analyses, air permitting and regulatory compliance strategies.
   http://www.aegis-environmental.com/services.html

EnviroChem Engineering Consultants  
   Located in Wolfville, Nova Scotia, Canada, the EnviroChem Engineering Consultants firm offers chemical engineering services as well as environmental engineering services. Their environmental services include ambient air monitoring, stack sampling and air
   http://home.istar.ca/~ece/model.html

The Air Group  
   Consultants located in Dallas, Texas, USA who offer air permitting and compliance services, air dispersion modeling, and training workshops.
   http://theairgroup.net

Northern Environmental and Monitoring Services (N.E.M.S.)  
   NEMS offers environmental, health and safety consulting services and their dispersion modeling expertise ranges from single stacks to multiple sources, spills and traffic pollution. NEMS is located in Darlington, England and uses the UK Atmospheric Disper
   http://www.n-e-m-s.demon.co.uk

Lehder Environmental Services  
   A Canadian consulting firm offering services in air dispersion modeling (including odor dispersion), stack sampling, and environmental permitting. Most of Lehder's modeling work for clients utilizes the U.S. EPA's Industrial Source Complex Short Term Mode
   http://www.lehder.com/airquality/air_dispersion.html

Pacific Environmental Services (PES)  
   Nationwide company headquartered in Herndon, Virginia, USA. The PES modeling section specializes in developing, evaluating, and applying air pollution dispersion models. PES was involved in developing the U.S. EPA's dispersion models, such as ISC3, SCREEN
   http://home.pes.com/disper.html

Risk Management Technologies  
   A firm located in Chennai, India offering: HAZOP training and software; air dispersion modeling; failure and reliability analysis; risk assessment; and accident investigation ... all targeted for the chemical process industries.
   http://xlweb.com/rmt/index.htm

Wenck Associates  
   Consulting engineers based in Maple Plains, Minnesota, USA with multiple other offices in Minnesota. Their services include the use of air dispersion modeling for air permitting, regulatory compliance studies, air toxics evaluation, and New Source Review
   http://www.wenck.com/air_svcs.htm

Mike Lyons and Associates  
   Consultants located in Balwyn, Victoria, Australia. Services offered include air pollution plume dispersion modeling using the Australian EPA's latest "AUSPLUME" package as required under the State Environment Protection Policy (SEPP).
   http://www.mikelyons.com.au

Pollution Control Consultancy and Design  
   An acoustical and environmental engineering consulting firm based in Sydney, Australia that provides a range of services which includes air dispersion modeling.
   http://www.pccd.com.au/airpol.htm

Pacific Air and Environment  
   A consultant group, headquartered in Brisbane, Australia with satellite offices in Melbourne and Sydney, who offer air quality modeling and emissions estimation services. The air dispersion models used include models developed in Australia (AUSPLUME, AUSP
   http://www.pae.net.au

The Weinberg Group  
   A scientific and regulatory consulting firm, headquartered in Washington,DC, whose services include air dispersion modeling.
   http://www.weinberggroup.com

Sanders Engineering & Analytical Services, Inc.  
   An environmental engineering firm based in Mobile, Alabama, USA that specializes in air permitting and air quality testing. Their air dispersion modeling includes the use of the U.S. EPA's ISC short and long term models, complex terrain modeling, and the
   http://www.sandersengineering.com/Index.htm

Vector AS  
   Vector AS is based in Tønsberg, Norway and offers air dispersion modeling using WindSim, which is a flow and dispersion simulator for complex terrain using computational fluid dynamics (CFD).
   http://windsim.com/

Cambridge Environmental Inc.  
   A group of environmental consultants headquartered in Cambridge, Massachusetts, USA. Their services include the use of air dispersion modeling in support of health risk assessments.
   http://www.cambridgeenvironmental.com/services/transport.htm

Dispersoft Consultants Inc.  
   A consulting firm headquartered in Sillery, Quebec, Canada, that offers service in air pollution dispersion modeling as well as other unrelated fields.
   http://www.dispersoft.qc.ca

Theakston Environmental Control, Inc.  
   Environmental consultants located in Ontario, Canada whose services include physical modeling as well as computer modeling of stack exhaust gas dispersion and dust dispersion.
   http://www.theakston.com/exhaust.htm

BlazeTech Corporation  
   Consultants (in Cambridge, Massachusetts, USA) with expertise in: air dispersion modeling, off-site consequence analysis, fire and explosion, and other safety problems. For dispersion modeling, the firm uses ADORA (Atmospheric Dispersion of Reacting Agent
   http://www.blazetech.com

Air Science Inc.  
   A consulting firm in Lakewood, Colorado, USA offering services in the air quality aspects of environmental impact studies, air quality and meteorological monitoring, dispersion modeling, visibility degradation analysis, and permitting of industrial facili
   http://www.airsci.com/

Consulting Air Pollution Modelers  
   A consulting group (located in North Clayton, Victoria, Australia) who provide: air pollution dispersion and consequence modeling services; complex terrain modeling; meteorological services; and training in dispersion modeling. The models used include AU
   http://www.camm.net.au

Enviroplan Consulting  
   A consulting firm (headquartered in Fairfield, New Jersey, USA) that offers services in air dispersion modeling, air quality and meteorological monitoring, air pollution emissions estimation, permitting and compliance plans, hazard assessments and risk ma
   http://www.enviroplan.com

Environmental Quality Management Inc. (EQ)  
   A consulting firm based in Cincinnati, Ohio (with multiple offices across the USA) that provides environmental engineering and air quality services including permitting, compliance studies, NSPS reviews, and air dispersion modeling.
   http://www.eqm.com/proj-des/air.html

EnCoCo  
   A firm headquartered in Lahaina, Hawaii, USA and offering air dispersion modeling software focused primarily upon the regulatory requirements of Germany.
   http://www.encoco.com

Pinchin Environmental Ltd.  
   A consultant group based in Mississauga, Ontario, Canada (with multiple offices in Canada) who offer air dispersion modeling services. The dispersion models utilized include Ontario Regulation 346 as well as these U.S. EPA models: Screen3, ISCST3, AERMOD
   http://www.pinchin.net/services/air/air.htm#Dispersion

Shell Engineering & Associates  
   Environmental management consultants located in Columbus, Missouri, USA. Their services include: air quality monitoring; air permitting; and air dispersion modeling involved in evaluating the offsite consequences of accidental releases and of air toxics e
   http://www.shellengr.com/Dispers.htm

UAI Environmental, Inc.  
   An environmental engineering and consulting firm based in Reading, Pennsylvania, USA that offers a range of air dispersion modeling services using models such as: AERMOD, ISC3, CALMET, CALPUFF, CTDMPLUS, ALOHA and others.
   http://www.uaienvironmental.com/model.asp

Jim Clary & Associates  
   Consultants, based in Dallas, Texas, USA, who offer dispersion modeling services and a proprietary Air Modeling Organizational System (AMOS) designed to create input files and organize all of the ISCST modeling runs for an entire project.
   http://www.jimclaryandassociates.com/default.htm

Entech Engineering  
   A consulting firm based in Westboro, Massachusetts, USA who provide technical support and computer software to the nuclear power industry in the areas of radiological engineering, and atmospheric dispersion of radioactive effluents.
   http://www.entechengineering.com/aeolus3.htm

Stone Lions Environmental Corporation  
   A consulting firm headquartered in Rolling Hills Estates, California, USA who offer services in air dispersion modeling, toxic chemical exposure evaluations, reconstruction of past environmental exposures, and specialized software.
   http://www.stonelions.com/homepage.htm

EnviroComp Consulting, Inc.  
   EnviroComp Consulting (based in Fremont, California, USA) develops and applies computational techniques to study environmental problems and, in particular, air pollution by using data analysis, simulation modeling, statistical methods, and advanced visual
   http://envirocomp.com/whoweare.htm

Cermak Peterka Peterson Inc. (CPP)  
   A wind engineering consulting firm (located in Fort Collins, Colorado, USA) that offers wind tunnel modeling of pollutant transport and dispersion involving complex building and terrain situations.
   http://www.cppwind.com/services/pollut.html

NPN Environmental Engineers  
   Consulting environmental engineering firm located in St. Louis, Missouri, USA. Services include air dispersion modeling, air emission inventories, air permitting and compliance programs.
   http://www.npnenv.com/air_quality.htm

Payne Environmental Corp.  
   An environmental consulting firm (headquartered in Madison, Connecticut, USA) whose services include air permitting, emission inventories, dispersion modeling studies, and health risk assessments.
   http://www.paynecorp.com/service4.htm

Stanger Science and Environment  
   Environmental consultants with multiple offices in England. Together with the University of Greenwich, Stanger operates a 24-hour telephone helpline for air dispersion modeling.
   http://www.stanger.co.uk/default.asp?page=airqual/modelhlp/helpline.htm

Exponent, Inc.  
   A firm of scientific and engineering consultants, headquartered in Menlo Park, California with multiple offices across the United States, whose services include air dispersion modeling.
   http://www.exponent.com/practices/hydrology/airquality.html

D&E Technical  
   D&E Technical is an environmental engineering and software development company located in Champaign, Illinois, USA. Their services include air dispersion modeling and hazard analysis.
   http://www.detech.net/aboutde.htm#Air

Janicke Consulting  
   A consulting firm located in Dunum, Germany who develop and market air dispersion modeling software, such as: LASAT, a Lagrangian dispersion model; IBJplume, a Gaussian model; IBJXodor; a model specifically for odor dispersion.
   http://www.janicke.de/htm/e_products.htm

Castings Development Centre  
   A research/development/consultancy facility located in Sheffield, England that uses the ADMS-2 dispersion model to offer air pollution dispersion modeling services to the castings production industry.
   http://www.castingsdev.com/

Applied Environmental Consultants, Inc.  
   Consultants located in Tempe, Arizona, USA who provide air dispersion modeling in support of air quality permitting and impact analyses as well as air quality regulatory compliance.
   http://www.aecinc.org/html/airimpact.html

Sullivan Environmental Consulting  
   This firm (located in Alexandria, Virginia, USA) offers services including urban scale air quality assessment, exposure assessment, permit support, air quality modeling, and risk management planning.
   http://www.sullivan-environmental.com/serv01.htm

Ambient Air Services, Inc.  
   Located in Starke, Florida, USA, this firm's services include: air dispersion modeling; stack design and building downwash evaluations; toxic air pollution studies, model validation studies; and air quality impact analyses.
   http://www.atlantic.net/~aasi/modeling.htm

Sage Environmental Services  
   An environmental consulting company based in Texas (with offices in Richardson, Austin and Beaumont)who offer services in air dispersion modeling, air permitting and compliance, risk management plans and offsite consequence analyses.
   http://www.sageenvironmental.com/services.htm

Envirotest  
   An environmental consulting firm based in Brisbane, Australia offering services in Environmental Impact Assessments and Environmental Risk Assessments, including the use of the AUSPLUME air dispersion model.
   http://www.envirotest.com.au/services/air_emiss.html

Engineering, Compliance & Construction, Inc.  
   Environmental engineering consultants based in Little Rock, Arkansas, USA who utilize air dispersion modling in their air permitting services, compliance studies and air toxics studies.
   http://www.ecci.com/envcapable/airdispersion.htm

Power Technology  
   The engineering and scientific center of PowerGen UK plc. They use various models to simulate gas and dust dispersion from: industrial chimneys, stockpiles, fugitive sources, accidental releases, and cooling tower plumes. The models include: ADMS (Atmosph
   http://www.powertech.co.uk/env_fuel/env_modelling.htm

P & I Design Ltd.  
   A chemical engineering and environmental management consultancy located in Stockton-on-Tees, England. They have developed a basic Gaussian dispersion model implemented with Microsoft's Excel spreadsheet program.
   http://www.pidesign.co.uk/disperse.htm

Aromatrix Pte Ltd  
   An odour control/abatement/design consultancy located in Singapore whose services include air dispersion modeling.
   http://www.aromatrix.com/AirDispersionModelling.htm

Weiss Associates  
   An environmental engineering, science and management firm headquartered in Emeryville, California, USA whose air quality services include air dispersion modeling.
   http://www.weiss.com/services/brochure/air-prog.html

ATMET  
   Environmental and meteorological consultants located in Boulder, Colorado, USA whose services include air pollution dispersion modeling, emergency response modeling, long range transport, and applied atmospheric research.
   http://atmet.com/html/about.shtml

Liase Environmental, Inc.  
   A consulting firm based in Dallas, Texas, USA offering air quality permitting and related environmental services including air dispersion modeling.
   http://www.liaise.org/airquality.html

Innovative Emergency Management, Inc.  
   A risk management company based in Baton Rouge, Louisiana, USA and offering software and consulting services nationwide. Included in their software offerings is D2-Puff, an air dispersion model developed specifically to predict the path and extent of plum
   http://www.ieminc.com/Products_and_Services/Project_descriptions/puff.htm

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